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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  09-Dec-1991 by Peter S. Fischl (PSF)

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Name IDAHO (L.2049), GOULDIE (L.708), TRACHYTE (L.2016S) Mining Division Similkameen
BCGS Map 092H038
Status Showing NTS Map 092H07E
Latitude 049º 18' 39'' UTM 10 (NAD 83)
Longitude 120º 32' 00'' Northing 5464938
Easting 679285
Commodities Copper, Gold Deposit Types L03 : Alkalic porphyry Cu-Au
Tectonic Belt Intermontane Terrane Plutonic Rocks, Quesnel
Capsule Geology

The Idaho showing is situated 600 metres southeast of the Similkameen River, 16 kilometres south of Princeton.

The area is underlain by the eastern facies of the Upper Triassic Nicola Group consisting of mafic augite and hornblende porphyritic pyroclastics and flows. These rocks are intruded by diorite and monzonite, locally pyroxenite and gabbro, of the Early Jurassic Copper Mountain and Lost Horse intrusions.

Syenodiorite of the Copper Mountain stock (Copper Mountain Intrusions) is cut by potassium feldspar porphyry dykes carrying copper mineralization. The dykes become larger and more numerous to the west. They appear to be related to the syenite pegmatite body outcropping along the Similkameen River in the core of the Copper Mountain stock.

Chalcopyrite and malachite occur in thin, short fracture fillings in the dykes. The fractures generally strike west and dip steeply north. A grab sample of this mineralization taken from a cliff face assayed 0.35 per cent copper and 1.0 grams per tonne gold (Assessment Report 2792, page 5). Similar mineralization occurs several hundred metres to the northwest on the Gouldie and Trachyte Crown-granted claims. Five chalcopyrite occurrences lie in an area up to 140 metres wide, extending 460 metres eastward from the Similkameen River. These occurrences are hosted in syenodiorite and syenite pegmatite of the Copper Mountain stock.

Cumont Mines Ltd. conducted geological, soil and magnetometer surveys over this showing in 1966 and 1970.

EMPR AR 1916-524
EMPR ASS RPT 838, *2792
GSC BULL 239, pp. 140,141
GSC MAP 300A; 888A; 1386A; 41-1989
GSC MEM 171; 243
GSC P 85-1A, pp. 349-358
CIM BULL Vol. 44, No. 469, pp. 317-324 (1951); Vol. 61, No. 673, pp. 633-636 (1968)
CJES Vol. 24, pp. 2521-2536 (1987)
Montgomery, J.H. (1967): Petrology, Structure and Origin of the Copper Mountain Intrusions near Princeton, British Columbia; unpublished Ph.D. thesis, University of British Columbia